Copy Text Files Between Drives

I have a batch of plain-text files sitting on one external USB drive and I simply need them replicated onto a second external drive I will provide. Nothing needs editing or conversion—just a clean, one-to-one transfer that preserves the original folder structure and filenames... (Budget: $15 - $25 USD, Jobs: Computer Support, Data Backup, Data Entry, Data Management, Data Processing, System Administration, Technical Support)